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Inside the new Qantas Dreamliner set to take Aussies direct from Perth to London

To celebrate tomorrow's official unveiling of Qantas' new Boeing 787-9 Dreamliner, the airline has given passengers a behind-the-scenes look at what to expect when you step on board.

Of the approximately 25,000 employees at the Boeing factory in Seattle, a team of more than 700 people work to construct a single Dreamliner. The massive industrial building is roughly the same size as 911 basketball courts combined, and has designated walkways and cycleways to ensure the workers can move quickly from each work site.

The arrival of Qantas' Dreamliner has been described by the airline's CEO, Alan Joyce, as a watershed moment for the Flying Kangaroo, because, for the first time, Australia will be directly linked to Europe with the introduction of a non-stop route from Perth to London.

The planes will be used to cart Aussies from Perth to London in the first ever direct flight from Australia to the UK. (9NEWS)

"This is a game-changing route flown by a game-changing aircraft. Australians have never had a direct link to Europe before, so the opportunities this opens up are huge."

The 14,498 kilometre journey will take approximately 17 hours, making it the third longest flight in the world, and the Dreamliner has been specifically designed to help minimise the effects of jetlag for travellers.

One of the new Dreamliners under construction at the Boeing factory in Seattle. (9NEWS)

There's no first class on the 236 seat Dreamliner, instead there are 42 seats in business, 28 in premium economy, and 166 in economy, with a more spacious design enhanced by improved air quality, 65 percent larger windows, and technology to reduce turbulence.

Premium economy travellers can expect to see more individual storage areas, more outlets to charge electronic devices, custom-made larger pillows and woven blankets. The seats are also configured in a 2-3-2 layout to make shuffling past your fellow travellers a little less intrusive.

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In economy, passengers will now be able to watch movies on a 12-inch high definition screen, sample snacks from one of two refreshment bars, and relax underneath integrated mood lighting.

There will be no first class on board, only business, premium economy and economy. (AAP)

While in Business, a good night's rest will be made much easier with a flat bed and direct aisle access.

Dining will now be 11 percent lighter, thanks to specially designed cutlery and glassware by David Caon and Noritake, with the menu arranged to help stimulate sleep or wakefulness during the stages of the journey.

The first Qantas Dreamliner route will be from Melbourne to Los Angeles, and the flagship Perth to London journey will take off from March next year.

In the meantime, Sydney travellers will get a first-hand glimpse at one of eight new aircrafts when it touches down in the Harbour City on Friday morning.